Keep in mind that with limited slip differentials that strength is only one factor. You also want a LS diff that locks up firmly (especially for drag racing). The Tlok does not lock up as well as the TT or the Auburn (those Auburn LS's are pretty stout-I likey). You can add clutch discs to the tlok to firm them up though. Any good shop can do this relatively cheaply. We used to do this to our 4by's to get them to act more like a locker than a LS.